Commutator



A. E. DOMAN.

COMMUTATOR.

APPLICATION FILIED 05c. 18, ms.

Patented Feb. 14, 1922.

I I/vvz/vraR C gTTOR Nevv UNITED STATES PATENT OFFICE.

ALBERT E. DOM-AN, 0F SYRACUSE, NEW YORK, ASSIGNOR TO DYNETO ELECTRIC COM- PANY, OF SYRACUSE, NEW YORK, A CORPORATION OF NEW YORK.

COMMUTATOR.

Specification of Letters Patent.

Patented Feb. 14, 1922.

Application filed December 18, 1918. Serial No. 267,367.

To all whom it may concern.

Be it known that I, ALBERT .E. DoMAN, a citizen of the United States of America, and resident of Syracuse, in the county of Onondaga, in the State of New York, have invented new and useful Improvements in Cominutators, of which the following, taken in connection with the accompanying drawthe present invention is to provide a more expeditious, economical and reliable means for securing these wires to their segments without the use of extra material and at the same time to provide a more convenient means for attaching wires of different gage.

In other wordsI have sought to utilize portions of commutator segments as the means by which the wires may be firmly clamped thereto and thereby to reduce the cost of manufacturing and to increase the general efiiciency of the commutator.

Other objects and uses will be brought out in the following description.

In the drawings:

Figure --1- is a side elevation of a commutator embodying the features of my invention.

Figure -2 is a transverse sectional view of the same.

Figure --3- is a sectional view similar to Figure 2- showing the tangs of the seg ments as compressed upon the interposed ends of the armature wires.

Figure -4 is a perspective view of one of the segments.

The commutator segments and the blank or bar from which it is made is similar to that set forth in my Patents, Nos. 1,282,051 and 1,282,052 issued Oct. 22, 1918, but the method of assembling the conductor segments and attaching the armature wires thereto are distinguished from those patents in'thatthe conducting segments are assembled in pairs circumferentially around the commutator shaft with relatively thin insulator segments between the several pairs while those of each pair are in electrical con tact and are provided with bendable jaws or tangs between which the corresponding ends of the armature wires are firmly clamped thereby to establish the necessary electrical connection without extra fastening means such as solder although the latter may be used in connection with the clamping jaws if desired.

The blank or bar from which the segments are made may be of any desired length and is of the same cross-sectional size and form from end to end corresponding to the maximum cross-sectional width, thickness and form of the required segment and is preferably thicker along its longitudinal center than at the opposite edges so that the opposite longitudinal and halves thereof are wedge-shape or tapered transversely from the longitudinal center, the angle between the opposite faces of each half depending upon the number of segments employed to complete the cylindrical commutator.

The commutator is therefore made up of a series of identical conductor segments 1 and insulating segments 2 assembled in compact relation circumferentially around a supporting shaft 3, said conducting segments being arranged in pairs and the inner halves of each pair being in electrical contact from end to end while the,

inner halves of the several pairs are separated by the insulators 2 of substantially the same radial width thus forming the cylindrical part or main body of the commutator, the major portion of the outer halves of the conductor segments being cut away along their longitudinal centers thus leaving relatively short radially projecting tapered jaws or tangs -4- on the inner ends of the conducting segments in circumferential alinement.

The opposite ends of the inner edge of each segment are cut away at -5 to form a dove-tail base -6 adapted to be engaged by similar but reversely arranged shoulders on the frame of the commutator for retaining the segments in their assembled relation.

The conducting segments -1- are therefore identical and interchangeable and when assembled with the insulating segments form a complete commutator in which adjacent faces of the radial tangs diverge outwardly and permit the ends of the armature wires of different gage to be insertedr between the jaws or tanks of each electrically Connected pair after which the jaws of the several pailis are firmly pinched together or compressed upon the interposed I wires to establish the desiredelectrical connection between said wires" and commutator. This manner of securing the wires to the conduct ng segments of the commutator assures not only amore rigid and reliable me- 7 chanical connection but also produces a more efficient electrical connection by reason of the direct metal to metal contact of the connected partsiwhich are usually both made of copper and are therefore easily compressible into closeand reliable contact.

011 the otherhand in case the armature wires should become impaired from any- .cause they may be readily disconnected from the commutator by simply springing the jaws or tangs apart and again reclamped upon the replaced wires by suitable pliers without extra 'fastening means.

Another advantage of this construction 1s that even'though the armature wlres may be soldered between the jaws,the latter when r pinched upon the wires will aid materially in preventing radial displacement of said wires by centrifugal force incase the solder should become loosened.

I claim' Acommutator comprising conductor seg-' ments arranged in pairs about a common axis, those of each pair having lengthwise V body-portions in contact, each segment having at one end an integral radially projecting tang portion of substantially thesame circumferential thicknessat the base as the body-portion and gradually tapered toward its outer end whereby the adjacent faces of the tangs of'each pair diverge ontwardly'at an acute angle from the base to permit thewires to be tightly fwedged between'the' adjacent faces of each pair by inward pres sure, the outer endsof said tangs ofeach pair being brought. together at the outside engagement with said faces. 7

In witness whereof I have hereunto set my hanc this 11th day of December,1918.

ALBERT E. 'DQMAN. lVitnesses:

I-L E. CHASE, a V ETI-IEL M. WILLIAMS.

of the wiresjto hold the wiresin operative 

